I bought some automatic drink cups from Cutler Supply (4085 Drink Cups). They recommended the 4011/4090 New Style Pressure Reducing Valve to be used with the drink cups, so I bought that too. I got the whole system hooked up a few days ago and have nothing but trouble with it. The drink cups work fine at extremely low water pressure (like 5 PSI) but become inoperative when the pressure is any higher then that. I thought that is what the pressure reducing valve was for, but it does not control the line pressure very well. I have cranked the regulator valve down to minimum and the line pressure still slowly increases until it is static with the water system (40 psi). Honestly I don't think this 4011/4090 valve is a pressure regulator at all. I think it is a flow restrictor. Either that or the one I got is defective. Has anyone else had this problem?